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Summary

JavaScript is a language written for websites to run in the client’s browser.

AJAX is a way for JavaScript to request data from a server without refreshing the page or blocking the application.

jQuery is a JavaScript library built to automate and simplify common web tasks like AJAX or animation.

Angular is a hip JavaScript framework which is made for building large, single-page web applications.

Node.js allows JavaScript to be run without a browser, and is commonly used to run web servers.